Urine culture - catheterized specimen

Catheterized specimen urine culture is a laboratory test that looks for germs in a urine sample.

How is the Test Performed?

This test requires a urine sample. The sample is taken by placing a thin rubber tube (called a catheter) through the urethra into the bladder. A nurse or a trained technician may do this.

First, the area around the opening of the urethra is thoroughly washed with a germ-killing (antiseptic) solution. The tube is inserted into the urethra. The urine drains into a sterile container, and the catheter is removed.

Rarely, the health care provider may choose to collect a urine sample by inserting a needle directly into the bladder and draining the urine. However, this is usually only done in infants or to immediately screen for bacterial infection.

The urine is sent to a laboratory. Tests are done to determine if there are germs in the urine sample. Other tests may be done to determine the best medicine to fight the germs.

Preparation for the Test

Do not urinate for at least 1 hour before the test. If you don't have the urge to urinate, you may be instructed to drink a glass of water 15-20 minutes before the test. Otherwise, there is no preparation for the test.

How will the Test Feel?

There is some discomfort. As the catheter is inserted, you may feel pressure. If you have a urinary tract infection, you may have some pain when the catheter is inserted.

Why is the Test Performed?

The test is done:

To get a sterile urine sample in a person who cannot urinate on their own

If you might have a urinary tract infection

If you cannot empty your bladder (urinary retention)

Normal Results for Urine culture - catheterized specimen

Normal values depend on the test being performed. Normal results are reported as "no growth" and are a sign that there is no infection.

What Abnormal Results Mean

A "positive" or abnormal test means germs, such as bacteria or yeast, are found in the urine sample. This likely means that you have a urinary tract infection or a bladder infection. If there is only a small amount of germs, your health care provider may not recommend treatment.

Sometimes, bacteria that do not cause urinary tract infections may be found in the culture. This is called a contaminant. You may not need to be treated.

People who have a urinary catheter in all of the time may have bacteria in their urine sample, but it does not cause a true infection. This is called being colonized.